1 Tore half of WBs face off (essentially killed him)
first & foremost he had to use a named attack which literally had no overall effect in stopping WB in fact WBs counter Quakepunch did more to Akainu than vice versa.... Akainu actually rag dolled by WB following that punch in which Akainu was removed from the following events on MF which was Teach vs WB
WB after Akainus punch btw....
2 Punched a whole through Ace (donut killed him)
clash of elements nothing more (this has been stated, in the same way Luffy was a hard counter for Enel Akainu was to Ace), additionally Ace intentionally solidified his body to protect Luffy intercepting Akainu and making himself vulnerable in the process.... in the world of one piece Magma even burns fire.......
Ace also equally clashed with Akainus counterpart and equal Aokiji.
3 Melted Aokijis arm and leg (handicapped him)
once again this had no real effect on Aokiji he just created a new leg and arm via ice and was able to fight old man Garp, and be an effective commander for Teach... hell he nearly solo'd BBP after the fact.
4 Melted Kumas leg (handicapped him)
literally had no effect on Kuma, hell he bodied Akainus sup[erior after that....
kuma after akainu "handicapped" him
imagine if Kuma was cognitive and stayed to fight Akainu wouldve been done in worse than WB was
5 Made BB + Crew run off losing Bonney (by himself)
woah am I to be impressed he also ran away from Shanks, telling them that his crew isnt ready yet.